After twenty years at a New York firm, middle-aged Alison Carter is fired and returns to her late mother's house, where a vintage pocket watch sends her back to her seventeen-year-old self. In high school she faces Vanessa's bullying, finds a time-freezing remote and love-inducing chocolate, and discovers that quarterback Ryan truly loves her and is immune to the magic. Vanessa steals the remote and serves Richard Winslow, who plots against the Twin Towers. Alison learns the truth, tells Ryan, and loses her magic. Ryan freezes time inside the towers and evacuates thousands. The crisis ends peacefully. Without magic, Alison and Ryan embrace genuine love and walk toward an ordinary, warm future.
